Frequency domain 3-D electromagnetic migration and imaging of sea-bottom geoelec- trical structures
نویسندگان
چکیده
In this paper we develop a fast 3-D electromagnetic (EM) migration method for marine geophysical exploration. The developed migration algorithm is based on downward extrapolation of the observed EM field using a special form of finite-difference equation for the migration field. It allows us to migrate within the sea-bottom formations the EM signals observed by the sea-bottom receivers. The migration field is subsequently transformed in the resistivity image of the sea-bottom geoelectrical structures. This technique is in an order faster than the conventional inversion. It can be used for fast imaging of the marine magnetotelluric (MT) and controlled-source electromagnetic (CSEM) data in off-shore hydrocarbon (HC) exploration.
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